And here's why UBS probably paid the big bucks to get him: during
his 17 years at Goldman, he had "the chance to work with a number
of the region’s wealthiest families,"
Finance Asia said.

There's little else in the way of details about which
families, but Kwok has been labeled a "hotshot" regularly in the
Chinese business daily,
The Standard:

Recently, paparazzi spotted him hob-knobbing with former hotshot
Goldman Sachs banker Kenneth Kwok Tak-sing, amid market talk that
he had sought Kwok's help to raise hundreds of millions from the
city's tycoons - only to be rebuffed for a variety of reasons.

At UBS, where he begins in July, he'll deliver the bank's "full
suite of products and services, with a focus on the investment
bank’s products, to ultra-high-net-worth clients and,
specifically, to those clients covered by the global family
office that UBS recently created,"
Finance Asia reports.